{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "2026.1.0-latest"
              },
              {
                "fixed": "2026.1.2"
              }
            ]
          },
          "events": [
            {
              "introduced": "322d3c0ac6a8f133b3f82875e9dbbe310f638c1b"
            },
            {
              "fixed": "808b2ac23d8ff421563b40203091026732471c60"
            }
          ],
          "repo": "https://github.com/discourse/discourse",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "2026.2.0-latest"
              },
              {
                "fixed": "2026.2.1"
              }
            ]
          },
          "events": [
            {
              "introduced": "f7cec86997edc21d6074ceb7666f7e2e6e1b1fdf"
            },
            {
              "fixed": "f38464e46df1b8c51f7d60826502476908d6bb2b"
            }
          ],
          "repo": "https://github.com/discourse/discourse",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "= 2026.3.0-latest"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "896e810e1b296478bba91559a8fc89a9926f11fe"
            }
          ],
          "repo": "https://github.com/discourse/discourse",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xq37-5fvf-4m4j"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27491.json"
  },
  "details": "Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.",
  "id": "CVE-2026-27491",
  "modified": "2026-04-01T23:10:10.073640282Z",
  "published": "2026-03-19T20:47:54.668Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27491.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27491"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Discourse has a bypass of official warnings messages by non-staff users"
}